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Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Equity Table [Line Items]        
Beginning Balance     115,457,067  
Ending Balance 116,566,078   116,566,078  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 1,797 $ 1,634 $ 1,767 $ 2,096
Net income (loss) 151 (13) 185 (475)
Other comprehensive income (loss) 1 1 1 0
Equity component of Exchangeable Senior Notes issuance, net 53   53  
Purchase of Exchangeable Senior Notes note hedge transactions (67)   (67)  
Tax benefit related to purchase of Exchangeable Senior Notes note hedge transactions 18   18  
Issuance of Exchangeable Senior Notes warrant transactions 46   46  
Exercise of stock options 1   1  
Stock-based compensation 8 4 14 10
Issuance of shares for vesting of equity awards 0 0 0 0
Shares withheld for taxes on equity awards (1) (1) (9) (5)
Dividends declared, APIC 0   0 0
Dividends declared (1)   (3) (1)
Ending Balance $ 2,006 $ 1,625 $ 2,006 $ 1,625
Common Stock        
Statement of Equity Table [Line Items]        
Beginning Balance 116,400,000 115,300,000 115,500,000 114,400,000
Issuance of shares for vesting of equity awards 200,000 100,000 1,600,000 1,500,000
Shares withheld for taxes on equity awards 0 0 (500,000) (500,000)
Ending Balance 116,600,000 115,400,000 116,600,000 115,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 1 $ 1 $ 1 $ 1
Issuance of shares for vesting of equity awards 0 0 0 0
Shares withheld for taxes on equity awards 0 0 0 0
Ending Balance 1 1 1 1
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 4,874 4,844 4,876 4,842
Equity component of Exchangeable Senior Notes issuance, net 53   53  
Purchase of Exchangeable Senior Notes note hedge transactions (67)   (67)  
Tax benefit related to purchase of Exchangeable Senior Notes note hedge transactions 18   18  
Issuance of Exchangeable Senior Notes warrant transactions 46   46  
Exercise of stock options 1   1  
Stock-based compensation 8 4 14 10
Shares withheld for taxes on equity awards (1) (1) (9) (5)
Ending Balance 4,932 4,847 4,932 4,847
Accumulated Deficit        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (3,022) (3,157) (3,055) (2,695)
Net income (loss) 149 (14) 182 (476)
Ending Balance (2,873) (3,171) (2,873) (3,171)
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (59) (57) (59) (56)
Other comprehensive income (loss) 1 1 1  
Ending Balance (58) (56) (58) (56)
Non- controlling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 3 3 4 4
Net income (loss) 2 1 3 1
Dividends declared, Noncontrolling Interest (1)   (3) (1)
Ending Balance $ 4 $ 4 $ 4 $ 4